Aminoanthraquinones



Patented May 7, 1940 UNITED STATES mean PATENT oFFic ANHNOANTHRAQUINONES tion, a corporation of Delaware No Drawing. Application December 17, 1937, Serial No. 180,318. In Germany December 23,

3 Claims.

The present invention relates to aminoanthraquinones.

,We have found that new valuable aminoanthraquinones are obtained by causing amines of the general constitution (in which R1 stands for an alkyl group having at least three carbon atoms and containing at least two hydroxyl groups and R2 for hydrogen or an alkyl, aralkyl or aryl group or an alkyl group containing at least two hydroxyl groups) either alone or in admixture with each other or in admixture with a mono-hydroxy-alkylamine to act on anthraquinone derivatives of the general constitution O X I l (in which X stands for H, OH, NHz or an alkylamine radical having at least two carbon atoms and containing at least one hydroxyl group, Y for OH, NI-Iz, halogen, N02 or an alkoxy or aryloxy group and in which the anthraquinone nucleus may contain any other atoms or groups) or on their leuco compounds, if desired in admixture with the said anthraquinone derivatives, and if desired oxidizing the leuco compounds thus first formed.

As amines of the said kind there may be mentioned for example 1-amino-2,3-dihydroxypropane, glucamine, alkylaminosorbitols and other amines of the sugar series having a corresponding structure.

As suitable anthraquinone derivatives there may be mentioned for example l-halogenanthraquinones, 1 nitro-anthraquinones, l-amino-4- methoxyanthraquinones, 1 amino 4 halogenanthraquinones, l hydroxyethylamino-l-halogenanthraquinones and l-amino-4-halogenanthraquinone-2-sulphonic acids. As suitable leuco compounds there may .be mentioned for example leuco-1.4-dihydroxyanthraquinone, leuco-l-amino-4-hydroxyanthraquinone, leuco-1,4-diaminoanthraquinone and leuco-l,4,5,8-tetrahydroxyanthraquinone.

In many cases it is not necessary to start with the ready-made leuco compounds, but the correthese examples.

sponding anthraquinone derivatives may also be used in the presence of a reducing agent, such as zinc dust or sodium hydrosulphite (if desired in an amount insufficient for the formation of the leuco compounds).

The compounds obtainable according to this invention are generally speaking dyestuffs with which dyeings of high clarity and good fastness maybe produced on cellulose esters and ethers. A special advantage lies in their good solubility in water, so that dyeing from aqueous baths may frequently be carried out Without the addition of dispersing or wetting agents or other dyeing assistants. The compounds, in the form of the sulphuric esters, may also be used as acid wool dyestufis.

The following examples will further illustratehow the said'invention may be carried out in practice but the invention is not restricted to The parts are by weight.

Example 1 A suspension of 5 parts of l-nitroanthraquinone in a solution of 10 parts of Lamina-2,3-

propanediol in 40 parts of pyridine is stirred at from to C. until initial material can no longer be detected. The mixture is then diluted with hot water, filtered and the filtrate, which may if desired be still further diluted with water,

allowed to cool; The l-propanediolaminoanthra quinone thus formed separates in red needles.

It dissolves well in boiling water giving a red coloration. Its solution in 90 per cent sulphuric acid is yellow-red in color; it changes to red upon heating. The compound yields powerful scarlet red dyeings on acetate artificial silk.

Example 2 A mixture of 5 parts of l-methoxy--nitrm' anthraquinone and 20 parts of 1-amino2,3-propanediol is heated to from to C. while stirring well until unchanged initial material can no longer be detected. For the purpose of separating the l-amino-4-propanediolaminoanthraquinone formed, 100 parts of 50 per cent aqueous alcohol are added to the reaction mixture, the

whole filtered and the new compound salted out.

,It is obtained in a'well-crystallized form and dissolves inhot water with a blue-violet colora- Example 3 A mixture of 12 parts of 1,4-dihydroxyantl1raquinone, 18 parts of 1-amino-2,3-propanediol, 12 parts of sodium hydrosulphite and parts of methanol is boiled under refluxwhile stirring until no 1,4-dihydroxyanthraquinone canbe detected in a sample withdrawn and oxidized. After cooling, the leuco compound of 1,4-di- (propane diolamino)-anthraquinone thus obtained is fil;

solves readily in warm water giving a blue color ation. Its solution in sulphuric acid hasa bluish.

red color. On cellulose ethersor'este'rsnit yields very fast blue dyeings.

If the aminopropanediol be replace'd"by glu"-" camine, a water-soluble, blue acetate artificial silk dyestuff is also obtained.

Example 4 A mixture of 24 parts of Lkdihydroxyanthra quinone, 6 parts of leuco-1.4-dihydroxyanthraquinone and parts of isobutanol is stirred at 60 C. while a mixture of 13.6 parts of l-aminO 2,3-propanediol and 9.2 parts of aminoethanol is added. The mixture is then stirred for 2 hours at the said temperature, then heated toboilin'g and boiled under reflux while stirring until 1A- dihydroxyanthraquinone can no longer'be detected in a withdrawn sample. In order to oxidize small amounts of leuco compound, air is led through the mixture; it is freed' from isobutanol by means of steam, whereby the major portion of the compound formed passes into solutionwith a blue coloration. I 7

After adding animal carbon, small amounts of undissolved constituents are filtered 'off 'ahdthe compound formed is saltedout with common salt from the deep blue mother liquorafter the addition of a little caustic soda solution." Itcfons'ists of a mixture of mainly 'l-propanediolainino j lj ethanolaminoanthraquinone, and a small amount of 1,4-dipropanediolaminoanthraquinone While the water-insoluble 1,4-di-(ethanola'mino) -anthraquinone also formed in small amounts is separated as the water-insoluble constituent by filtration of the aqueous solution, j

The blue powder thus obtaineddissolves' in sulphuric acid giving a bluish red "coloration. It dissolves in warm water giving a deep-blue colore ation and yields powerful blue dyeings of 'ex' cellent fastness on cellulose ethers and esters.

Example 5 A mixture of 14 parts of leuco-1,4,5,8tetrahydroxyanthraquinone, 18 parts of 1'-am'ino-2,3- propanediol and 100 parts of butanol is heated to boiling under reflux until initial material is no longer present. The compound formed,- which partly separates out even while hot, is filtered oif by suction after cooling, washed with methanol and dried. It may be oxidized to 1,4-di- (propanediolamino) -5,8-dihydroxyanthraquinone by heating with nitrobenzene in the presence-of piperidine as described in Example 3. The said compound is soluble in water giving a blue-green coloration and dyes cellulose ethers and esters very fast blue-green shades. Its solution in sulphuric acid is bluish red in color.

The compound obtainable in the same way from glucamine and leuco-1,4,5,8-tetrahydroxyanthraquinoneis also soluble in water and blue-green in color. ljt -may be used for dyeing acetate artificial silk." 7 Example 6 ,:A mixture of 12 parts of l-amino-Z,3-propane- 'diol and 8 parts of aminoethanol is added to a suspension of '28 parts of leuco-1A,5,8-tetrahydroxyanthraquinone in 200 parts of isobutanol an'd'the mixtureheated to boiling under reflux until initial material can no longer be detected.

After cooling,'the separated crystals are filtered 'off by suction, washed with methanol, dried and then. oxidized to the anthraquinone derivative with piperidine and nitrobenzene in known man ner. The portion of the resulting substance which is soluble in. the aqueous layer inthe then following treatment with steam is freed from small amounts of water-insoluble 1,4-diethanol amino 5,8 dihydroxyanthraquinone simultaneou'sly formed and separated from the deep blue-f green filtrate by salting" out. It consists mainly of 1-propanediolamino-4ethanolamino-5,8-dihydroxyanthraquinone and a small amount of 1,4- dipropanediolamino-5,8-dihydroxyanthraquinone. It is a blue powder which dissolves in warm water giving a blue-green coloration and yields powerful blue-green dyeings of excellent fastness on cellulose ethers and esters.

What we claim is:

1. An anthraquinone derivative of the general formula NHR1 x o l l o nn-cm-omon V o NH-CHa-CHOEFOHnOH. 3. Theanthraquinone derivative of the for Q 1 on o NEE-CHz-CHOH-CHaOI-l FRITZ BAUMANN.

ARTUR KRAUSE. HEINZ-WERNER SCI-IWECHTEN;

ROBERT ZELL.

- ass 

